A) potentiometer
B) moving coil galvanometer
C) moving magnet galvanometer
D) hot wire voltmeter
Correct Answer: D
Solution :
In a potentiometer, the null point will fluctuate due to varying current & voltage. In the moving magnet /coil galvanometer, the dial will be unsteady due to varying current through it. In hot wire voltmeter, the principle of heat due to current is used to measure the voltage. \[{{P}_{avg}}=\frac{V_{RMS}^{2}}{R}\] \[\therefore \]\[V_{RMs}^{2}=R\,{{P}_{avg}}\] \[\therefore \]\[\]
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